Method for individually characterizing the layers of a hydrocarb

Details Method for individually characterizing the layers of a hydrocarb Method for individually characterizing the layers of a hydrocarb

1990-10-19

1993-09-28

Williams, Hezron E.

Measuring and testing

Borehole or drilling

Downhole test

166250, E21B 4700, E21B 4900

Patent

active

052478297

ABSTRACT:
The invention relates to reservoir evaluation and is more specifically directed to a method of characterizing the individual response of a layer of a multi-layer hydrocarbon reservoir traversed by a well, based on downhole flow rate and pressure measurements performed during transient tests initiated by changes in the surface flow rate of the well, the flow rate being measured above said layer during one transient test and below said layer during another transient test. The variations of downhole pressure and flow rate with respect to their respective values at the initiation of the transient test are determined, each of said flow rate variations is normalized by the pressure variation after the same time interval within the same transient test, thereby to produce a first pressure-normalized flow rate function for the level above said layer and a second pressure-normalized flow rate function for the level below said layer, and said first and second pressure-normalized flow rate functions are subtractively combined to generate a function representative of the individual response of said layer.

REFERENCES:
patent: 4597290 (1986-07-01), Bourdet et al.
patent: 4893504 (1990-01-01), O'Meara, Jr. et al.

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